Date: Mon, 20 Sep 2004 11:30:37 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: current@freebsd.org Subject: Re: Brief freezes with -current as of early last week Message-ID: <20040920183037.GA61741@parodius.com> In-Reply-To: <20040920161628.GG30307@clan.nothing-going-on.org> References: <20040920100038.GA30307@clan.nothing-going-on.org> <20040920160019.GA3403@VARK.MIT.EDU> <20040920161628.GG30307@clan.nothing-going-on.org>
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PREEMPTION isn't a kernel option -- it's something you tweak in /usr/include/machine/param.h (or /usr/src/include/...), unless this procedure has changed recently... -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. | On Mon, Sep 20, 2004 at 05:16:30PM +0100, Nik Clayton wrote: > On Mon, Sep 20, 2004 at 12:00:19PM -0400, David Schultz wrote: > > This sounds like an I/O hang. I've been having similar problems > > related to WRITE_DMA and READ_DMA timeouts from the ata driver in > > the last week or so, as discussed last week on this list. Are you > > seeing these messages from the kernel? > > Like these? > > ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=47240127 > ad0: WARNING - READ_DMA no interrupt but good status > ad1: TIMEOUT - READ_DMA retrying (2 retries left) LBA=165370263 > ad1: WARNING - READ_DMA no interrupt but good status > > ad0 is a 2 year old 40GB disk, ad1 is 1 week old 120GB disk. > > > Julian suggested disabling > > preemption, which I haven't tried yet, but other people report > > limited success. > > I'm not running a kernel with 'options PREEMPTION' compiled in... > > N > -- > FreeBSD: The Power to Serve http://www.freebsd.org/ (__) > FreeBSD Documentation Project http://www.freebsd.org/docproj/ \\\'',) > \/ \ ^ > --- 15B8 3FFC DDB4 34B0 AA5F 94B7 93A8 0764 2C37 E375 --- .\._/_)
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